Chemical repairing device for petroleum casing pipes

Abstract

The invention relates to a chemical repairing device for petroleum casing pipes. According to the technical scheme, the outer wall of a central pipe is fixedly connected to a reaction auxiliary cylinder liner, and the inner cavity of the reaction auxiliary cylinder liner is provided with an aluminum thermal reactant. A plurality of inclined holes are formed in the outer wall of the reaction auxiliary cylinder liner, and the inclined holes are blocked by a tin plug. An inner cavity of the central pipe is sequentially provided with an ignition fixing sleeve, an igniter, an ignition lock ring, acombustible ball seat, a combustible sealing sleeve and a wire blocking body from bottom to top. Ignition is realized by the ignition lock ring pushing the igniter, and the combustible ball seat is ignited, and further the combustible sealing sleeve is burnt, at the same time, the combustion of the combustible ball seat can realize high temperature heating to the aluminum thermal reagent in the reaction auxiliary cylinder liner, and an aluminothermic reaction is induced. The chemical repairing device for petroleum casing pipes has the beneficial effects that generated molten iron and an aluminum oxide enter the cavity between the center pipe and an oil well casing, and the section to be repaired is filled to realize the casing repair. A steel ball, a lighter and the like are used for igniting, processes are reduced and construction costs are saved.

Description

technical field [0001] The invention relates to a repairing device for petroleum pipes, in particular to a chemical method repairing device for petroleum casing. Background technique [0002] During the exploitation of oil and gas fields, due to complex geological conditions, such as inclined wells, horizontal wells, etc., oil well casing damage often occurs. Oil well casing damage will cause the following hazards to oilfield development: 1. The production string cannot be run into the well normally; 2. When the damaged part of the casing is in the water layer or sand layer, the oil well will produce a large amount of water or sand; 3. The oil well will increase production The measures cannot be carried out; 4. It is easy to cause blowout outside the casing; 5. It causes the oil well to be scrapped. [0003] There are several methods for repairing cracked casings with seams or holes: 1. Squeeze the grout: When the pressure of the oil layer is not high and the rupture and le...

AI Technical Summary

Problems solved by technology

The advantage of this method is to ensure the consistency of the inner diameter of the casing, and the downhole tools can pass through smoothly in future operations; the disadvantage is that the casing thread of the downhole buckle is not as tight as that on the wellhead, and the replacement of casing More expensive and more difficult to operate

[0004] Among them, the problems of the subsidy repair method are: when sand control is required, sand control pipe strings need to be run in; Fracturing pipe string; since the inner diameter of the steel pipe is smaller than the inner diameter of the casing, the diameter and specification of the running tool need to be reduced, resulting in a smaller amount of injected liquid, which affects the effects of sand control, acidizing and fracturing. In addition, the steel pipe Form a boss shape on the inner wall of the casing, so that the running string is prone to jamming

[0005] The problem with the cement-squeezing method is that when acidification is required on site, because the cement is alkaline, the acid will react with the cement, which will cause the repaired leaks to leak out again.

But the problem that it exists is: the triggering of the thermite reaction is by putting into the reaction inducing pipe string, and the bottom of the reaction inducing pipe string is provided with an electric heating pipe, which is connected to the electric heating pipe at the wellhead through a cable to the aluminum alloy in the inner chamber of the refractory protective sleeve. The thermal reaction raw materials are heated, and the construction process is relatively troublesome

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